Which of the following is not a good reason why white-dwarf supernovae are good standard candles for distance measurements?
A) White-dwarf supernovae are so bright that they can be detected even in very distant galaxies.
B) All white-dwarf supernovae involve the explosion of stars of nearly the same mass.
C) White-dwarf supernovae occur only among young and extremely bright stars.
D) White-dwarf supernovae are common enough that we detect several every year.
E) All white-dwarf supernovae have similar light curves, which makes them easy to distinguish from massive-star supernovae.
C
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64,200,000,000 is equal to
a. 6.42 × 10^7. b. 6.42 × 10^?7. c. 6.42 × 10^10. d. 6.42 × 10^?10. e. 1.0 × 10^64.2.
Radioactive Decay: The half-life of cobalt-60 is 5.3 years, while that of strontium-90 is about 29 years. Suppose you have samples of both isotopes, and that they initially contain equal numbers of atoms of these isotopes. How will the activities (number of decays per second) of the samples compare?
A. The activity of the cobalt-60 sample will be greater. B. The activities cannot be compared without more information. C. The activities will be equal. D. The activity of the strontium-90 sample will be greater.
Are small ripples sent out across the surface of a lake truly "waves", as that word is used in physics?
A) Yes, because the water itself doesn't go anyplace but simply oscillates up and down. B) No, because true water waves are longitudinal. C) Yes, because the water itself moves across the lake, away from the source of the wave. D) No, because the water's motion is "mass motion", similar to the motion of a ball that has been thrown. E) No, because the water itself doesn't go anyplace but simply oscillates up and down in one place.
Optics is divided into ray optics and ______________ optics
Fill in the blank(s) with correct word